<!-- index.html -->
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Web Worker Example</title>
<script src="./main.js" defer></script>
</head>
<body>
  <h1>Fibonacci Calculator</h1>
  <input type="number" id="numberInput" placeholder="Enter a number">
  <button id="calculateButton">Calculate Fibonacci</button>
  <p id="result"></p>
</body>
</html>